Hollow cement building-block.



N0.aoo,o67. f PATBNTBD sPT.19,19o5`.

L H. D. BROOKE. HOLLOW CEMENT BUI-LMNG BLOCK.

Arrmcukxon :umn-116ML 19044.

NITED strains PATENT orrion.

HIAL D. BROOKE, OF SAN FRANCISCO, CALIFORNIA, ASSIGNOR TO WILLIAM KOLMAN, JAMES W. BUTLER, AND COURTNEYv VAN RIPER, OF SAN FRANCISCO, CALIFORNIA.

HOLLOW CMENT BUILDING-BLOCK.

Specification of Letters Patent.

Patented Sept. 19, 1965.

Asphalia nea November 4, 1904.. serai No. 231,464..

To a/ZZ whom t may concern.-

` Be it l'znown that I, HIAL D. BROOKE, a citizen of the-United States, residing at San Francisco, inthe county of San Francisco and State of California, have invented a new and useful Improvement in Hollow Cement Building- Blocks, of which the following is a'specica-- tion.

This invention relates to cement buildingblocks, and has for its object to produce a comparatively simple inexpensive device of this character in which a free circulation of airthrough a wall or other ystructure composed of the blocks will be maintained, one wherein expansion and contraction are minimized and one in which the individual blocks will be securely locked in position in the wall.

regardless of the cement or other binding material employed.

With these and other objects in view theinvention comprises the novel features of construction and combination of parts more fully hereinafter described. v

In the accompanying drawings. Figure 1 is a perspective view, partly in section; of a portion of a wall constructed of my improved opening or passage 4, provided centrally and vertically through the block. The side sections 1 of the block have formed upon their normally lower edges longitudinally-extending ribs or tongues 5, preferably of substantially semicircular form in cross-section, while formed in the normally upper edges ofthe sections are longitudinal grooves or channels 6, of a cross-sectional form, corresponding to that of the tongues and adapted in practice to receive the latter, there being formed in the upper and lower edges of the webs 2, at aJ point centrally between the sections 1, semicircular grooves or channels 7, arranged parallel with the longitudinal axis ofthe block and communicating at their ends with the passages and opening 4:, respectively. In practice when a numberof the blocks are assembled for erecting a wall, as illustrated in Fig. 1, the grooves 6 in the blocks composing one course of the wall receive the tongues 5 of the superposed blocks forming the contiguous course of the wall, thus securely locking the individual blocks in position. It is to be observed that the blocks in each course are arranged in end wise alinement with their adjacent ends abutting, whereby the tongues 5 and grooves 6 will be practically continuous throughout the entire length of the wall and the channels 3 in the meeting ends of the blocks conjointly produce vertical air flues or passages. It is further to be noted that the meeting ends of a pair of blocks in one course of the wall are disposed between the ends of a block in a contiguous course, whereby the locking ,of the blocksin the wall is more effectually accomplished and the air passages or flues formed by the channels 3 are disposed above and between the ends of the opening 4 in the underlying block, while at'the same time the air-passages 7 insure the free circulation of air from one opening 4 to another and also from apair of adjacent openings 4 into and through the passages 3.

From the foregoing it is apparent that I produce a simple .buildingblock which in practice will sufficiently perform its functions to the attainment of the ends in view, it being understood that minor changes in the details herein'set forth may be resorted to Without departing from the spirit of the invention.

Having thus fully described the invention, i

what is claimed as newisof spaced side sections 'and transverse connectbeing situated at a point between the side sec- Ioo . 9o A hollow building-block comprising a pair tions and adapted to communicate with the end channels and central opening, l(ind u 10ngitudinally-extending tongue provided on one side edge of each of the sections, the opposite edge of each section being provided with a corresponding longitudinal groove.

In testimony whereof I have hereunto signed my nume to this speeiiiezition in the presence of two subscribing witnesses.

HlAL D. BROOKE.

VitneSSeS:

JAS. W. BUTLER, WM. KOLMAN. 

